Seagate (STX) CEO Mosley settles RSUs, withholds shares to cover tax

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported compensation-related equity activity. On March 9, 2026, restricted share units converted into 5,230 ordinary shares of Seagate stock. To cover tax obligations, 2,613 shares were withheld at $374.33 per share rather than being sold on the open market.

Following these transactions, Mosley directly holds 398,514 ordinary shares. The filing reflects routine vesting and settlement of equity awards under Seagate’s 2022 Equity Incentive Plan, rather than discretionary open‑market buying or selling.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MOSLEY WILLIAM D

(Last) (First) (Middle)

SEAGATE TECHNOLOGY HOLDINGS PLC

47488 KATO ROAD

(Street)

FREMONT CA 94538

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Seagate Technology Holdings plc [ STX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	03/09/2026		M		2,815	A	$0	398,712	D
Ordinary Shares	03/09/2026		F		1,406	D	$374.33	397,306	D
Ordinary Shares	03/09/2026		M		2,415	A	$0	399,721	D
Ordinary Shares	03/09/2026		F		1,207	D	$374.33	398,514	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Unit	$0	03/09/2026		M			2,815	(1)	(1)	Ordinary Shares	2,815	$0	5,630	D
Restricted Share Unit	$0	03/09/2026		M			2,415	(2)	(2)	Ordinary Shares	2,415	$0	24,158	D

Explanation of Responses:

1. Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

2. Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment, one-quarter vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	03/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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FAQ

What did Seagate (STX) CEO William D. Mosley report in this Form 4?

William D. Mosley reported routine equity compensation activity. Restricted share units converted into ordinary shares, and some of those shares were used to satisfy tax obligations, reflecting standard vesting and settlement under Seagate’s 2022 Equity Incentive Plan rather than discretionary market trades.

How many Seagate (STX) shares were acquired through RSU vesting in this filing?

The filing shows RSU conversions into 5,230 ordinary shares. These shares came from previously granted restricted share units that vested under the company’s 2022 Equity Incentive Plan, increasing Mosley’s direct share position before accounting for shares withheld to cover related tax liabilities.

Were any of the Seagate (STX) CEO’s shares sold on the open market?

No open-market sales are reported. The only dispositions use code “F,” which indicates shares were withheld to pay exercise price or tax liabilities. This is an administrative mechanism and does not represent discretionary selling into the market by the CEO.

How many Seagate (STX) shares were withheld for taxes in this Form 4?

A total of 2,613 ordinary shares were withheld for tax obligations at a reported price of $374.33 per share. This tax-withholding disposition is standard for vested equity awards and differs from voluntary sales in the open market by the reporting person.

What is William D. Mosley’s Seagate (STX) shareholding after these transactions?

After the reported RSU conversions and tax withholdings, Mosley directly holds 398,514 ordinary shares. This post-transaction balance, shown in the Form 4 tables, provides context that the reported activity represents a small portion of his overall direct equity position.

Which equity plan governed the Seagate (STX) RSUs in this Form 4?

The RSUs are granted under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Footnotes explain that these awards vest over four years, with one-quarter vesting on specified dates and the remaining units vesting in equal quarterly installments, subject to continued employment.